Context Menu > Start Workflow
This action opens a new browser tab allowing you to create a new Workflow, where the workflow will explicitly be about the selected asset.
Note
The difference between normal workflows and workflows that are about a given asset is that the latter should only contain edits that relate to that asset. TopBraid does not strictly enforce this, because it is often difficult to decide whether a change is related to a certain asset or not. However, you may define custom workflow templates that implement stricter policies and prevent certain workflow transitions if edits are outside of the scope of an asset.
See Also
Further Reading on Workflows
Further Reading on TopBraid